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Q46. If a and b are natural numbers and a-b is divisible by 3, then a3-b3 is divisible by:
A. 3 but not by 9
B. 9
C. 6
D. 27
Ans. B
Q47. The cost price of 10 articles is equal to the selling price of 9 articles. find the profit percent.
A. 101/9 %
B. 100/9 %
C. 102/9 %
D. 103/9 %
Ans. B
Q48. P is an integer. P>883. If P-7 is a multiple of 11, then the largest number that will always divide (P+4) (P+15) is:
A. 11
B. 121
C. 242
D. None of these
Ans. C
Q49. What is the ratio of number of years which have imports above the average imports to those which have imports below the average imports?
A. 5:3
B. 2:6
C. 3:8
D. none
Ans. D
Q50. Ritu has 3 shirts in shades of red, 4 in yellow shades and 5 in green shades . Three shirts are picked at random.
The probability that all of those are in red shades is :
A. 2c3/13c3
B. 1c3/13c4
C. 3c3/12c3
D. 5c3/10c3
Ans. C